Pretty easy in fact, you will just need a four contact switch (or an eight contact switch in case you want to go to a Gbit network some day) to just cut off the lines. It'll appear to your computer like you just pulled the plug.

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hi,
what about using a hub or switch that has a built in button for cross-over.
you could enable or disable the cross over function thereby disconnecting or connecting whenever needed by using the button.

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